skaeb



May 5, ,1925. 1,536,942"

A. P. SKAER COLMN HEAD FRAME Filed Oct. 15, 1923 Patented May 5, 1925.,

ITE

STATES ARTHUR P. SKAER, OF BUFFALO, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS,`

:PATENT Price.,

TO KALMAN STEEL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF DELA# WARE.

COLUMN-HEAD' FRAME.

Application led October 13, 1923. Serial No. 668,276.

fcoluinn exposed to View and without formin brackets thereon.

My invention consists principally iin ems bedding inthe concrete concentric with the axis of the column and' at the level of the Hoor slab a hollow conical metal shell preferably with an outer shell concentric there` with and connected therewith. It also con frame embeddedin the concrete construction; f 1

Fig. 3 is a. plan view of a modified form of frame;

Fig. l is a vertical central sectional view of said modified forni'embedded in concrete; and

Fig. 5 shows another niodilication. *In the construction illustrated in Fig. 1, the frame comprises a central portion 11 in the form of a hollow truncated cone, whose top opening is smaller than the bottom opening so that the concrete 12 which is within said cone is confined and thereby made capable of transmitting the floor load more uniformly into the column. tric with the central cone 11 is a second truncated cone 13 of larger diameter but preferably of the same depth as the inner cone 11. These two cones may be integrally connected by a multiplicity of radial arms 14.. The top opening of the outer cone is smaller than the bottom opening thereof7 thereby forming an outer inclined surface which constitutes a support for the iioor Concen-v slab without reducing the effectiveness of the said slab to take vertical shear.

The outerv periphery of the frame corresponds with the outer margin of the ein posed and enlargedy heads of present day practice. i i q In the modification illustrated inFigs. 3 ande the frame comprises an outer hollow truncated cone 13 and a central portion in the form of a hollow truncated pyramid 11a formed by intersecting chord members 15 of the outer hollow truncated cone, thusconiining the concrete inside said` pyramid yas is done by the central hollow conical portion 11 in Figs. y1 and 2. The outer conical portion 13 in Figs. 3 and -l is the same as shown in Figs. 1 and 2, but the connecting members l5 between the central portion and outer portion are chordal instead ofradial.

In practice, the column khead frame is centered on the axis of the column and at the level of the floor slab, the top opening of the central cone being smaller than the cross section of the column so that the confined concrete inside of this said cone will lie whollywithin the horizontal section of the column, and said frame isthin enough from top to bottom to permit the proper lacing of the lslab reinforcement above or 'elow said frame. Preferably the top opening of this' central cone is less than the cross sectionvof the concrets slope or taper of the cone is preferably in thev Lneighborhood of forty-tive degrees. Concentric with the central cone 11 is a second truncated cone 13 of larger diameter y but `preferably ofv the same depth as the inner cone 11. These two cones are integrally connected by a multiplicity of radial arms 14. Forinstance, the outer cone may be dispensed with in which case the inner cone may be used either with or without the radial arms.

The principal advantages of my invention are the following: It concentrates the metal in a manner which will most etliciently take care of the stresses heretofore provided for by the enlargement of the column below the slab; and, in thus concentrating the metal, it provides for openfil ings oi? such extent as to insure the proper placing oi column reinforcement '16, A'conduits rand the flow of concrete in and around the metal head, thereby eliminating voids in the concrete. lhile the .load or the floor slab acts vertically, it is sup ported by the conical outer surface of the frame whose reaction is perpendicular 'to such conical suriace, and by the horizontal force which said slab exerts against said conical suriiace. By confining the concrete 'over the column, by means'of a hollow conical member vor `a hollow 'truncated Ipyramid, the loadof the slab is distributed over I oi such designs.

a greater arca ot the column, thus avoiding large concentrations of stress directly under the metal where it bears on the column.

Another great advantageis that `the device is `Well adapted for manufacture out oiircast metal,`which,in turn, is 'well adapted to take ycare oi the stresses to which it will lbe subjected in practice. As an incidentto the manufacturing process, the designer has full control over the proportionate distribution ol the metal inthe different parts of the' device.

Obviously the designs of column vhead frames hereinbetore illustrated are typical and admit of great variation in det-ail; and I do not wish to be restrictedfto the details F or instance, `instead of making` the two rconcentric shells integral with each other, it may be preferable to nralrethem separate, as illustrated in flig. 5. In such case, it is preferable that the top `openin` ofthe outer 4shell be smaller than the bottom opening of the inner shell.

that I cla-im is:

l. 'In concrete construction, the combination with a concrete column and a concrete slabsupported thereby ot a metal frame embedded in the concrete concentricwith the column and at the levelo'ttlre-slab, said trame comprisingl a truncated shell which has a taper in the'neighborhood ot iorty- 'live degrees and whose top opening is less than the 'cross section ot the column. Y

2. ln concrete construction, the combination with a concrete A-column and a concrete slab supported thereby et a metal frame eintbedded inthe concrete'concentric 4with the column and at the level ot the slab, said frame comprising a truncated shell whose opening` 'is least at itstoprand 1is there less than the cross section of -the column and whose opening at the bottom is greater than the cross section ot the column.

3. ln concrete construction, the combination with a column and a concrete slab supported `thereby ot a metal frame en'ibedded in the concrete concentric with the column and atlhelevel o'trtheslab, said trame comprising a conical shell whose top opening is less than the cross section ofthe coluninand whose bottom opening is greater than the crosssection ol the column.

4. In concrete construction, the combination with acolumnfand a concrete slab supported'ther'eby ot' a metal 'frame embedded in the Vconcrete 'concentric with the column and at the level of the slab, said :frame comprising concentric truncated shells of less opcning1at the top than vatthe bottoni,l and armsconnecting said shells.

5. In concrete construction, the vcombination with=a column and a concrcteslab supported thereby of a metal trame embedded comprising an inner hollow shell that tapers upwardly and an outer hollow shell that tapers upwardly, said shells beinglrigidly connected byfspaced: arms.

t. A. framelor a column head comprising inner and outer 'truncated conical shellscennected together by 'radial arms integral therewith.

Signed iat Buiilalo, New York, this 9th day of October,f1923. f

l Aurina-i. P. enana. 

